qml.estimator.templates.SingleQubitComparator¶

class SingleQubitComparator(wires=None)[source]

Bases: ResourceOperator

Resource class for comparing the values encoded in two input qubits.

This operation modifies the input qubits. The original values can be restored by applying the operation’s adjoint.

Parameters:: wires (WiresLike | None) – the wires the operation acts on

Resources:

The resources are obtained from appendix B, Figure 5 in arXiv:1711.10460. Specifically, the resources are given as \(1\) TemporaryAND gate, \(4\) CNOT gates, and \(3\) X gates. The circuit which applies the comparison operation on qubits \((x,y)\) is defined as:

  x: ─╭●───────╭●─╭●──── x
  y: ─├○────╭●─╰X─│───X─ x=y
|0>: ─╰X─╭●─│─────│───── x<y
|0>: ────╰X─╰X────╰X──── x>y

Example

The resources for this operation are computed using:

>>> import pennylane.estimator as qre
>>> single_qubit_compare = qre.SingleQubitComparator()
>>> print(qre.estimate(single_qubit_compare))
--- Resources: ---
 Total wires: 4
    algorithmic wires: 4
    allocated wires: 0
         zero state: 0
         any state: 0
 Total gates : 8
  'Toffoli': 1,
  'CNOT': 4,
  'X': 3

Attributes

`num_wires`
`resource_params`	Returns a dictionary containing the minimal information needed to compute the resources.

num_wires = 4¶

resource_params¶

Returns a dictionary containing the minimal information needed to compute the resources.

Returns:: An empty dictionary
Return type:: dict

Methods

`resource_decomp`()	Returns a list representing the resources of the operator.
`resource_rep`()	Returns a compressed representation containing only the parameters of the Operator that are needed to compute the resources.

classmethod resource_decomp()[source]¶

Returns a list representing the resources of the operator. Each object in the list represents a gate and the number of times it occurs in the circuit.

Resources:

The resources are obtained from appendix B, Figure 5 in arXiv:1711.10460. Specifically, the resources are given as \(1\) TemporaryAND gate, \(4\) CNOT gates, and \(3\) X gates.

The circuit which applies the comparison operation on wires \((x,y)\) is defined as:

  x: ─╭●───────╭●─╭●──── x
  y: ─├○────╭●─╰X─│───X─ x=y
|0>: ─╰X─╭●─│─────│───── x<y
|0>: ────╰X─╰X────╰X──── x>y

Returns:: A list of GateCount objects, where each object represents a specific quantum gate and the number of times it appears in the decomposition.
Return type:: list[GateCount]

classmethod resource_rep()[source]¶

Returns a compressed representation containing only the parameters of the Operator that are needed to compute the resources.

qml.estimator.templates.SingleQubitComparator¶

Attributes

Methods

Contents